volumetric_water_content#

hydrometlib.cosmos.volumetric_water_content(cts_mod_corr, ref_soc, ref_bulkdensity, ref_latticewater, n0_mod, n_min, n_max)[source]#

Calculate volumetric water content (VWC) from corrected neutron counts and site annotations [%]

VWC is the total volume of water present in a given volume of soil, represented as a fraction of the soil volume occupied by water (the remainder of the fraction being solid particles and air pockets).

\[\theta_v = 100 \, \rho_b \left( \frac{0.0808}{\dfrac{C_{corr}}{N_0} - 0.372} - 0.115 - \theta_{lw} - \theta_{soc} \right)\]

where \(\rho_b\) is ref_bulkdensity, \(\theta_{lw}\) is ref_latticewater and \(\theta_{soc}\) is ref_soc. \(C_{corr}\) is first clipped to [n_min, n_max] and the result is clipped to [0, 100].

References

Parameters:

  • cts_mod_corr (Expr) – Neutron counts, corrected for influences on cosmic-ray intensity [counts h-1]. Must be on the same counting interval as n0_mod, n_min and n_max, since only the ratio cts_mod_corr / n0_mod is used.

  • ref_soc (Expr) – Site attribute of reference soil organic carbon [g g-1]

  • ref_bulkdensity (Expr) – Site attribute of reference soil bulk density [g cm-3]

  • ref_latticewater (Expr) – Site attribute of reference lattice water content [g g-1]

  • n0_mod (Expr) – Site attribute of a calibration coefficient obtained from field calibration [counts h-1]

  • n_min (Expr) – Site attribute of minimum range for neutron counts [counts h-1]

  • n_max (Expr) – Site attribute of maximum range for neutron counts [counts h-1]

Return type:

Expr

Returns:

Expression or Series for VWC [%], clipped to 0-100.